<template>
  <el-container class="home-container">
    <!--头部-->
    <el-header>
      <div>
        <img src="../assets/images/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="danger" @click="logout">退出登录</el-button>
    </el-header>
    <!--页面主体-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCallapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--侧边栏菜单-->
        <!--主菜单-->
        <el-menu
          :default-active="activePath"
          :router="true"
          :collapse-transition="false"
          :collapse="isCallapse"
          :unique-opened="true"
          background-color="salmon"
          text-color="darkslategray"
          active-text-color="bisque">
          <!--一级菜单-->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!--一级菜单模板-->
            <template slot="title">
              <!--图标-->
              <i :class="iconsObj[item.id]"></i>
              <!--文本-->
              <span>{{ item.authName }}</span>
            </template>

            <!--二级菜单-->
            <!-- 路由跳转默认使用index跳转，利用index赋值为'/'+地址实现按地址跳转 -->
            <el-menu-item
              @click="saveNavstate('/' + subItem.path)"
              :index="'/' + subItem.path"
              v-for="subItem in item.children"
              :key="subItem.id">
              <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--右侧主体-->
      <el-main>
        <!--路由占位符-->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menulist: [],
      // 图标列表
      iconsObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao',
      },
      isCallapse: false,
      // 被激活的地址
      activePath: ''
    }
  },
  // 生命周期函数。获取菜单信息
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      // 清空token
      window.sessionStorage.clear()
      // 编程重定向
      this.$router.push('/login')
    },
    // 获取所有菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if(res.meta.status !== 200 ) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      console.log(res)
    },
    //点击按钮展开所有菜单或折叠
    toggleCollapse() {
      this.isCallapse = !this.isCallapse
    },
    // 保存链接的激活状态
    // 保存链接地址
    saveNavstate(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: salmon;
  display: flex;
  justify-content: space-between;
  padding-left: 10px;
  padding-right: 10px;
  align-items: center;
  color: bisque;
  font-size: 25px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 10px;
    }
  }
}

.el-aside {
  background-color: darksalmon;
  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: bisque;
}

.iconfont {
  margin-right: 10px;
}

.toggle-button{
  background-color: darksalmon;
  font-size: 10px;
  line-height: 24px;
  color: bisque;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
